Leather-cutting cylinder



(No Model.)

B. MARBLE. LEATHER CUTTING GYLINDBR.

No. 525,052. Patented Aug. 28, 1894 ZMZ'ZZQESEEE. Frags l Y 'x/EJZ Ur. W(5% W.

To all whom it may concern:

UNITED "STATES PATENT -OFFICE.

EDW IN T. MARBLE, QF WORCESTER, MASSACHUSETTS.

LEATHER-CUTTING CYLINDER.

SPECIFICATION forming part of Letters Patent No. 525,052, dated August28, 1894,

Application filed May 19,1890. SerialNo. 35 2,340- (No model-l Be itknown that I, EDWIN T. MARBLE, a citizen of the United States, residingat Worcester, in the county of Worcester and State of Massachusetts,have invented a new and useful Rotary Cutter -Oylinder forLeather-Working Machines, of which the following, together with theaccompanying drawings, is a specification sufficiently full, clear, andexact to enable persons skilled in the art to which this inventionappertains to make and use the same.

This invention which relates to that class of bladed rolls or revolublecuttercylinders employed in machines for scraping or shaving hides andskins, for whitening, dressing or Working leather, and for otheranalogous purposes; is an improvement in the construction of thecutter-cylinder, the object of Which is to provide a more desirable andpractically efficient appliance for the purpose named; and to overcomecertain objections incident to mechanismof this class as heretofore madeand employed.

To this end my invention consists in the cutter-cylinder having itsblades or cutters constructed and disposed in the peculiar manner shownand described.

Cutter-cylinders or rolls for shaving or working leather haveheretofore, in some in-, stances, been made with spiral cutters orblades; the helical curvature of all of the blades being uniform andcontinuous in one direction throughout the length of the cylinder; oragain, in some instances, a series of short blades have been employedall having a helical trend toward one end of the cylinder, some withgreater or less inclination, but

either of such style of blades when at work tends to crowd the stock orleather to one side by the incline of the blades. In other instances thecylinders have been provided at one end with blades disposed. with aright hand helical curvature, and at the opposite end with blades havingleft hand helical curvature, the blades from the two ends meeting at ornear the center in V form; this style of cutter-cylinders is, however,objectionable in that it works the leather a part to the right and apart to the left on different parts of the cylinder, and leaves a ridgeor variation at the position corresponding with the junction of theright and left spirals of the knives.

My invention provides a roll or cutter-cylinder for the purpose named,wherein the right and left working trend of the cutters or blades willact uniformly upon the entire surface over which the cylinder passes.The periphery of thebladed-roll or cutter-cylinder being furnished fromend to end of its face in diiferent sections of its circumference withoppositely inclined series of blades disposed in the peculiar orderillustrated, for the purpose specified.

In the drawings, Figure l is a side view of a cutter-cylinderconstructed in accordance with my invention. Fig. 2 is an end view ofthe same. Fig. 3 is a diagram, on smaller scale, showing the arrangementof the blades on a plain development of the periphery of the cylinder.

In referring to parts, A denotes the shaft or axle, B the body of thecylinder, and O the blades, cutters, or working flanges which arerigidly fixed in the periphery of the body and stand outward therefromin radial direction.

In accordance with my invention the periphery of the cylinder is,circumferentially, apportioned into alternate sections or series ofhelically disposed blades having opposite inclination or direction oftrend in the respective sectionsthe series of blades of one section orportion of the cylinder circumference being all disposed with a righthand inclination or helical order, as at R; and the series of blades ofthe following section or portion of the cylinder circumference being alldisposed with a left hand inclination or helical order, as at L. Eachsection comprises in its series, several principal blades 0 that extendspirally from end to end of the cylinder, as at 2; and paralleltherewith a number ofshorter blades 0 of successively varied length thatoccupy the angular area between a rear principal blade and cylinder end,as shown. The leading ends of the short blades 0 in the left hand seriesall abut against or terminate adjacent to the rear long blade 0 of theright hand series; and the.

leading ends of the short blades of the right hand series all abutagainst or terminate adjacent to the rear of the principal blade 0 ofthe left hand inclined series, in the manner illustrated. The blades ineach series are preferably parallel with each other and the shorterblades meet the principal blade that extends completely across thecylinder at about a right angle, more or less, at their leading ends orplaces where they abut against said rear blade 0 of the oppositelyinclined series; and from thence extend to the outer end of thecylinder. Hence when in use, the surface of the skin acted upon is, bythe revolution of the cylinder, worked with the left hand spiral bladesfollowed by the right hand spiral blades, or vice versa, in rapidsuccession; the material being uniformly dressed, since the workedsurface is exposed to a continually changing diagonal cut or scrape,alternately with the right and left inclined series of blades, at eachrotation of the mechanism.

The cutter-cylinder is here shown as provided with two circumferentialsections, one right and the other left; but cylinders of larger diametercould be made with a greater number of alternating blade-sections. It isbest, however, to have an equal number of sections with blades tendingto the right as to the left.

The outer edges of the blades may be sharp and angular, or may berounded and dull as best suited to the requirements of the particularwork to be performed, accordingly as the roll or cylinder is to beemployed in machines for fieshing, buffing, or shaving hides and skins;or for dressing, Whitening, smoothing or finishing leather, or for otheranalogous purpose.

I do .not confine myself to any particular number of blades, or anyparticular size of blades or dimension of cylinder; but in cases wherethe size of the cylinder admits, andmore than two sections of diagonalblades are employed, the blades would be disposed in the peculiar orderindicated in the diagram Fig. 3.

It will be observed that the construction and arrangement of the bladesare such that when the cylinder is moving forward in the directionindicated by the arrow the inclination of the blades will tend to throwthe chips and scrapings out from between the blades at the end spaces 6.that there are no closed spaces or pockets within which chips and dustwould become confined.

Another advantage incident to my invention is that theblade'cylinderimparts a scrape or cut alternately at right and leftdiagonal,

and equal upon the entire surface acted upon,

thereby giving a fine uniform surface with- It will also belnoticed outridges, and without tendency to draw the leather to one side, or awayfrom a central line.

This improved cutter-cylinder is applicable to and intended for use inthe various kinds of machines for shaving, scraping or working and notof my invention, it is unnecessary to herein illustrate theirconstruction, as any person conversant therewith will understand theapplication of my improved cutter-cylinder thereto.

I am aware that cutter-cylinders having right and left helical blades orflanges have heretofore been employed, in which the blades are arrangedwith opposite inclinations from a central point in the length of thecylinder, all of the rightinclined blades being'located on one end ofthe cylinder, and all of the left inclined blades located on theopposite end of the cylinder; it will therefore be understood that I donot make claim broadly to a cuttercylinder irrespective of theparticular construction illustrated and defined.

I claim as my invention herein, to be secured by Letters Patent- 1. In acutter-cylinderfor the purpose specified, the blades disposed about theperiphery of the body in alternating triangular groups each comprising aseries of helical blades, said series of blades being oppositelyinclined on opposite portions of the circumferential circle of thecylinder, their helical trend directed from the right to the left forone half or portion of the circle, and from the left to the right forthe alternate half or portion of the circle, substantially as set forth.

'2. The within described bladed-cylinder having thereon at diiferentcircumferential portions two oppositely inclined series of blades, eachseries comprising blades 0 that extend helically from end to end of thecylinder, and shorter blades 0 of successively varying length parallelwith said longer blades, their leading ends abutting againstor adjacentto the rear blade of the preceding series, and from thence extending tothe end of the cylinder, as shown and described.

Witness my hand this 12th day of May, A. D. 1890.

EDWIN T. MARBLE. Witnesses:

CHAS. H. BURLEIGH, ELLA P. BLENUS.

